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support/support_copy_file.c
43 строки
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Paul Eggert
Update copyright dates with scripts/update-copyrights
02 янв 2026, 00:42
02 янв 2026, 00:42
66f3e92
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/* Copy a file from one path to another. Copyright (C) 2020-2026 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ #include <fcntl.h> #include <support/check.h> #include <support/support.h> #include <support/xunistd.h> void support_copy_file (const char *from, const char *to) { struct stat st; xstat (from, &st); int fd_from = xopen (from, O_RDONLY, 0); mode_t mode = st.st_mode & 0777; int fd_to = xopen (to, O_WRONLY | O_TRUNC | O_CREAT, mode); ssize_t ret = support_copy_file_range (fd_from, NULL, fd_to, NULL, st.st_size, 0); if (ret < 0) FAIL_EXIT1 ("copying from \"%s\" to \"%s\": %m", from, to); if (ret != st.st_size) FAIL_EXIT1 ("copying from \"%s\" to \"%s\": only %zd of %llu bytes copied", from, to, ret, (unsigned long long int) st.st_size); if (fchmod (fd_to, mode) < 0) FAIL_EXIT1 ("fchmod on %s to 0%o: %m", to, mode); xclose (fd_to); xclose (fd_from); }